Use of Manganese Oxide and Activated Carbon Fibers for Removing a Particle, Volatile Organic Compound or Ozone from a Gas

a technology of activated carbon fiber and manganese oxide, which is applied in the direction of catalyst activation/preparation, metal/metal-oxide/metal-hydroxide catalyst, etc., can solve the problems of not enough evidence to support the mvk mechanism and prior studies have failed to address the issue of successfully implementing this technology, so as to reduce the content and reduce the content of volatile organic compounds

Inactive Publication Date: 2014-09-11
RGT UNIV OF CALIFORNIA
View PDF3 Cites 53 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0010]The present invention also provides for a method for reducing a volatile organic compound (VOC) content of a gas, comprising: contacting the gas comprising one or more VOC with a MnOx catalyst, thereby obtaining a gas having a reduced content in the VOC as compared to the gas before contacting it with the MnO2 catalyst.
[0011]The present invention also provides for application of the MnOx catalyst to a particle filter so that the VOC content of the gas stream passing through the filter is reduced by the catalyst.
[0014]In some embodiments of the invention, the composition is useful for coating the interior surface of a duct system, or the surfaces of heating and cooling coils. Formaldehyde in air that flows through the ducts or heating or cooling coils can be decomposed and this air, with a reduced formaldehyde concentration can be subsequently supplied to a building's interior. The advantage of coating these non-visible surfaces that contact indoor air is that a large amount of the manganese oxide catalyst can be applied without concerns about producing a visually unattractive surface. In some embodiments of the invention, the composition is used for coating a surface that is not normally visible to an occupant of a building, such the interior surface of a duct.

Problems solved by technology

Although study exists on the MnO2 catalytic oxidation of formaldehyde there is not enough evidence to support the MvK mechanism.
Prior studies also fail to address the issue of implementing this technology successfully to eliminate gaseous formaldehyde at indoor levels.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Use of Manganese Oxide and Activated Carbon Fibers for Removing a Particle, Volatile Organic Compound or Ozone from a Gas
  • Use of Manganese Oxide and Activated Carbon Fibers for Removing a Particle, Volatile Organic Compound or Ozone from a Gas
  • Use of Manganese Oxide and Activated Carbon Fibers for Removing a Particle, Volatile Organic Compound or Ozone from a Gas

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0118]In this study, we synthesized novel MnOx catalysts (1

Experimental Methods

[0119]Preparation of Manganese Oxide Catalysts.

[0120]Sodium permanganate (≧97%) and manganese sulfate monohydrate (≧98%) were obtained from Sigma Aldrich and used without further purification. Manganese dioxide (>98%) was also obtained from Sigma Aldrich to use as a reference in formaldehyde removal tests. Manganese oxide samples were prepared using a chemical co-precipitation route. Manganese sulfate (MnSO4) and sodium permanganate (NaMnO4) are dissolved in distilled water. To the manganese sulfate aqueous solution, the sodium permanganate solution was added slowly with constant stirring such that the molar ratio of the resulting s...

example 2

[0156]In some embodiments of the invention, the device comprises an integrated-technology air cleaner (ITAC) capable of removing VOCs, and optionally particles and optionally ozone, from indoor air with a high efficiency. The device has approximately the same rates of removal of indoor-generated particles and VOCs in a typical single-family house, and also reduces indoor concentrations of outdoor-air VOCs and ozone. In some embodiments of the invention, the device has an air flow rate of 100 cfm, a removal efficiency of 70% for a range of VOCs and for 0.3 micrometer size particles, and a time-average power consumption less than 50 w.

[0157]FIG. 5 shows a schematic of the design of the air cleaner which uses three air cleaning technologies in an integrated manner to remove particles, volatile organic compounds (VOCs), and ozone from indoor air. Indoor air enters from the top of the air cleaner and first passes through a particle filter that removes particles. The particle filter could...

example 3

Manganese Oxide Catalysts

[0160]In a field demonstration, deployment of a catalyst-treated filter reduces indoor formaldehyde concentrations by about 80%. Tests indicated that high humidity conditions do not significantly affect the performance of the manganese oxide catalysts. Test indicate little inactivation of the catalyst after long-term continuous use.

[0161]ACF Systems.

[0162]Heating air to regenerate the ACF media results in improved regeneration efficiency with respect to that achieved by directly heating the media, a finding that makes regeneration more practical using existing HVAC hardware. A double layer of ACF cloth shows improved performance for all VOCs, but most critically it results in a doubling of the removal efficiency for formaldehyde. To facilitate deployment of the air cleaning systems in existing buildings, including those with roof-top systems, we developed a conceptual design for an air cleaner that is connected to the ductwork of an existing HVAC system.

[016...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

PropertyMeasurementUnit
temperaturesaaaaaaaaaa
temperatureaaaaaaaaaa
molar ratioaaaaaaaaaa
Login to view more

Abstract

The present invention provides for a device for reducing a volatile organic compound (VOC) content of a gas comprising a manganese oxide (MnOx) catalyst. The manganese oxide (MnOx) catalyst is capable of catalyzing formaldehyde at room temperature, with complete conversion, to CO2 and water vapor. The manganese oxide (MnOx) catalyst itself is not consumed by the reaction of formaldehyde into CO2 and water vapor. The present invention also provides for a device for reducing or removing a particle, a VOC and / or ozone from a gas comprising an activated carbon filter (ACF) on a media that is capable of being periodically regenerated.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS[0001]This application claims priority as a continuation application to PCT International Patent Application No. PCT / US2012 / 40807, filed Jun. 4, 2012, which claims priority to U.S. Provisional Patent Application Ser. No. 61 / 493,375, filed Jun. 3, 2011, both of which are hereby incorporated by reference in their entireties.STATEMENT OF GOVERNMENTAL SUPPORT[0002]The invention was made with government support under Contract Nos. DE-AC02-05CH11231 awarded by the U.S. Department of Energy. The government has certain rights in the invention.FIELD OF THE INVENTION[0003]The present invention is in the field of reducing gas pollutants.BACKGROUND OF THE INVENTION[0004]Manganese dioxide (MnO2) is a relatively abundant and inexpensive metal oxide. Manganese oxide-based nanoparticles have been used for water purification for a long time (Prasad and Chaudhuri 1995). The redox properties of manganese oxide minerals make them useful catalysts in industrial pro...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
Patent Type & Authority Applications(United States)
IPC IPC(8): B01J23/34A61L9/00B01J20/20C09D7/61
CPCB01J23/34A61L9/00B01J20/20B01J37/031B01J21/18B01D53/8668B01J35/002B01J35/006B01J35/04B01J35/06B01J35/1009B01J35/1019B01J37/0215C09D1/00B01D2253/102B01D2255/2073B01D2257/106B01D2257/708C09D7/61Y02A50/20B01J35/023B01J35/1023B01J35/1028B01J37/08
Inventor SIDHESWARAN, MEERA A.DESTAILLATS, HUGOFISK, WILLIAM J.
Owner RGT UNIV OF CALIFORNIA
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap